package com.hmall.gateway.filter;

import com.hmall.common.exception.UnauthorizedException;
import com.hmall.common.utils.CollUtils;
import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.util.JwtTool;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

@Slf4j
@Component
@RequiredArgsConstructor
@EnableConfigurationProperties(AuthProperties.class)
public class AuthGlobalFilter implements GlobalFilter, Ordered {

    private final JwtTool jwtTool;

    private final AuthProperties authProperties;

    private final AntPathMatcher antPathMatcher = new AntPathMatcher();

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 获取Request
        ServerHttpRequest request = exchange.getRequest();
        //请求路径
        String path = request.getPath().toString();
        //白名单
        List<String> excludePaths = authProperties.getExcludePaths();
        //判断当前请求路径是否是白名单,使用antPathMatcher进行匹配
        for (String excludePath : excludePaths) {
            boolean match = antPathMatcher.match(excludePath, path);
            if (match) {
                return chain.filter(exchange);
            }
        }
        //获取请求头的token
        String token = exchange.getRequest().getHeaders().getFirst("authorization");
        if(token==null){
            //如果token为空则返回401错误
            ServerHttpResponse response = exchange.getResponse();
            response.setRawStatusCode(401);
            return response.setComplete();
        }
        //如果token不为空则校验token
        Long userId = null;
        try {
            userId = jwtTool.parseToken(token);
        } catch (Exception e) {
            //返回token无效的错误
            ServerHttpResponse response = exchange.getResponse();
            response.setRawStatusCode(401);
            return response.setComplete();
        }

        // TODO 5.如果有效，传递用户信息
        log.info("userId:{}",userId);
        exchange.getRequest().mutate().header("user-info", userId.toString());
        // 6.放行
        return chain.filter(exchange);
    }


    @Override
    public int getOrder() {
        return 0;
    }
}